Video of behavior: http://ogrestrength.com/nostart.mov
Datalogs and msqs:
1989 BMW 325i w/ M30B35 engine from 1991 535i, HX40 turbo setup
MS2 v3.57 board
Wasted spark with DIY autotune coils + Glen's Garage breakout board
MS 3.0.3.r
Tune reset to an MSQ that was known to work last year. So, my crank settings and everything should be fine.
72lb/hr Low-Z injectors
New starter, getting ~300rpm cranking. Pulling down to about 90kpa vacuum
No idle control, just a cracked throttle plate (tried the gas during cranking)
Battery trickle charged back to 12.5v+ before starting
Car was working fine until about January, when the flywheel bolts vibrated loose. Once that was sorted, the car randomly seemed to run on 4 cylinders - it would start, but ran horribly. So, I dug into the wiring, and re-did a BUNCH of the grounds - I thought it was probably a weak spark issue. I pulled the ground wire from the GG wasted spark board by hand, so I thought that was the culprit. I screwed some other grounds up in the process, but I believe everything to be alright now.
FUEL:I can hear the fuel pump prime pulse when the key is turned. I have a gauge fore of the fuel rail and it's reading 45 psi. I'm not SURE if the injectors are firing, but the (switched ground) wiring seems OK, and I checked that I had 12v at every injector with the key in running position. Should I test the injectors somehow to make sure that they're firing? Could the Low-Z be causing issues? Do I just pull the darn fuel rail and spray fuel into a bucket?
SPARK: I pulled a wire from each coil pack to ensure I was getting switched ground, I am. I didn't have a good connection to the tower (just barely touched) so I had a weak orangy spark. I tested one coil pack with a proper spark wire and got white-blue spark. The spark plugs ran a little rich in tuning the turbo, but I'd think they should be ok enough to start the car considering until I messed with the wiring it could at least run itself on a few cylinders with a bad spark ground.
COMPRESSION: I'm pulling some vacuum during cranking (down to 90kpa) - I'm not sure how else to test this. The behavior didn't start after any hard running; the car's been sitting except for intermittent attempts to start it for more or less 5 months. Should I be seeing more vacuum?
Timing/Pickup: I'm kind of leaning this way. My tooth log shows 1-4 sync loss events in some of the cranking logs, would this be considered normal? Is this enough to prevent starting? I'm getting a decent rpm signal, it seems, but my tooth logger does show a "2nd longer tooth" that the literature I've read suggests a "compression effect" - I wasn't able to get the trigger logger to save to csv in tunerstudio, but my signal looked very much like this: http://www.msextra.com/doc/ms2extra/...60_2_crank.png
I did redo the wires for the VR sensor pickup, could that have caused this issue?
I feel like I'm incredibly close to having this thing running again, I just could use some help to figure out...whatever this is.
Ryan
Datalogs and msqs:
1989 BMW 325i w/ M30B35 engine from 1991 535i, HX40 turbo setup
MS2 v3.57 board
Wasted spark with DIY autotune coils + Glen's Garage breakout board
MS 3.0.3.r
Tune reset to an MSQ that was known to work last year. So, my crank settings and everything should be fine.
72lb/hr Low-Z injectors
New starter, getting ~300rpm cranking. Pulling down to about 90kpa vacuum
No idle control, just a cracked throttle plate (tried the gas during cranking)
Battery trickle charged back to 12.5v+ before starting
Car was working fine until about January, when the flywheel bolts vibrated loose. Once that was sorted, the car randomly seemed to run on 4 cylinders - it would start, but ran horribly. So, I dug into the wiring, and re-did a BUNCH of the grounds - I thought it was probably a weak spark issue. I pulled the ground wire from the GG wasted spark board by hand, so I thought that was the culprit. I screwed some other grounds up in the process, but I believe everything to be alright now.
FUEL:I can hear the fuel pump prime pulse when the key is turned. I have a gauge fore of the fuel rail and it's reading 45 psi. I'm not SURE if the injectors are firing, but the (switched ground) wiring seems OK, and I checked that I had 12v at every injector with the key in running position. Should I test the injectors somehow to make sure that they're firing? Could the Low-Z be causing issues? Do I just pull the darn fuel rail and spray fuel into a bucket?
SPARK: I pulled a wire from each coil pack to ensure I was getting switched ground, I am. I didn't have a good connection to the tower (just barely touched) so I had a weak orangy spark. I tested one coil pack with a proper spark wire and got white-blue spark. The spark plugs ran a little rich in tuning the turbo, but I'd think they should be ok enough to start the car considering until I messed with the wiring it could at least run itself on a few cylinders with a bad spark ground.
COMPRESSION: I'm pulling some vacuum during cranking (down to 90kpa) - I'm not sure how else to test this. The behavior didn't start after any hard running; the car's been sitting except for intermittent attempts to start it for more or less 5 months. Should I be seeing more vacuum?
Timing/Pickup: I'm kind of leaning this way. My tooth log shows 1-4 sync loss events in some of the cranking logs, would this be considered normal? Is this enough to prevent starting? I'm getting a decent rpm signal, it seems, but my tooth logger does show a "2nd longer tooth" that the literature I've read suggests a "compression effect" - I wasn't able to get the trigger logger to save to csv in tunerstudio, but my signal looked very much like this: http://www.msextra.com/doc/ms2extra/...60_2_crank.png
I did redo the wires for the VR sensor pickup, could that have caused this issue?
I feel like I'm incredibly close to having this thing running again, I just could use some help to figure out...whatever this is.
Ryan
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